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Non-insulating type switching power supply device

a non-insulating type, power supply device technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of delay generation, switching loss cannot be set to zero, switching loss and switching frequency means an average loss, etc., to suppress switching loss and electromagnetic noise.

Active Publication Date: 2016-08-09
NISSHINBO MICRO DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively suppresses switching loss and electromagnetic noise, enabling high-efficiency operation at high switching frequencies by ensuring zero-volt switching and minimizing current peaks through the switches, thus reducing overall power loss and noise levels.

Problems solved by technology

The product of switching loss and switching frequency means an average loss.
However, in general, the MOS FET has gate resistance, delay is generated by the gate resistance, and the switching loss cannot set to zero.
Due to generation of self-turn on, and increase in the peak of the charge current, the electromagnetic noise is accidentally increased.
The electromagnetic noise is the external disturb to the signal during communication, malfunction in peripheral devices may occur.

Method used

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  • Non-insulating type switching power supply device
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  • Non-insulating type switching power supply device

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0046]FIG. 1 is a block diagram illustrating a configuration of a switching power supply device 10 according to a first embodiment. The switching power supply device 10 is a non-insulating step-down switching power supply device to convert an input voltage Vin into an output voltage Vout with synchronous rectification method. In FIG. 1, the switching power supply device 10 includes a high-side switch SW1 and a low-side switch SW2 directly connected between a voltage source of the input voltage Vin and a ground terminal, an inductor L1 connected between an output terminal VOUT and a junction node LX between the switches SW1 and SW2, a capacitor C1, connected to the junction node LX, that constitutes a resonant circuit with the inductor L1, and a capacitor C2 that smoothes the output voltage Vout at the output terminal VOUT. The switches SW1 and SW2 are, for example, Metal-Oxide Semiconductor Field Effect Transistor (MOSFET).

[0047]In addition, the switches SW1 and SW2 have on-resistan...

second embodiment

[0081]FIG. 7 is a block diagram illustrating a configuration of a switching power supply device 10C according to a second embodiment. In the switching power supply device 10 according to the first embodiment, using PFM control, the switching frequency fluctuates. By contrast, in the switching power supply device 10C according to the second embodiment, in order to keep the switching frequency at a constant value, the length of ON-period of the switch SW1 is kept and is controlled so that the lower limit of the inductor current Ilx fluctuates. Under an ideal condition in which the on-resistances of the switches SW1 and SW2 are zero, when the input voltage Vin and the output voltage Vout are determined, the duty ratio is determined. Accordingly, if the ON-period of the switch SW1 is constant, an OFF-period of the switch SW1 is constant. That is, in the switching power supply device 10C according to the second embodiment, by setting the length of 1 cycle of the operation of the switchin...

third embodiment

[0103]FIG. 11 is a block diagram illustrating a configuration of a switching power supply device 10F according to a third embodiment. In the above-described first and second embodiments, the switching power supply devices 10(10A, 10B, 10C) are step-down switching power supply devices. The switching power supply device 10F shown in FIG. 11 is configured as a step-up switching power supply device, based on the switching power supply device 10C shown in FIG. 7.

[0104]In FIG. 11, the switching power supply device 10F includes the inductor L1 and a switch SW51 connected in series between the voltage source of the input voltage Vin and the ground terminal, a switch SW52 connected between the output terminal VOUT and the junction node LX between the inductor L1 and the switch SW51, a capacitor C1, connected to the junction node LX, that constitutes a resonant circuit with the inductor L1, and a capacitor C2 that smoothes the output voltage Vout at the output terminal VOUT. The switches SW51...

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Abstract

A switching power supply device includes a first control circuit that turns a first switch on when first and second switches are off and a voltage at a junction node therebetween is increased to decrease a voltage across the first switch to a first threshold voltage, turns off when a first ON-period has elapsed from when the first switch is turned on, and lengthens the first ON-period as an output voltage decreases relative to a reference voltage; and a second control circuit that turns the second switch on when both switches are off and a voltage across the second switch is decreased to a second threshold voltage, turns off when a reverse current flows through the inductor, sufficient to increase the voltage at the junction node to decrease the voltage across the first switch to the first threshold voltage after the second switch is turned off.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This patent application is based on and claims priority pursuant to 35 U.S.C. §119 to Japanese Patent Application No. 2012-202318, filed on Sep. 14, 2012 in the Japan Patent Office, the entire disclosure of which is hereby incorporated by reference herein.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to a switching power supply device, in particular, a synchronous rectifying non-insulating type switching power supply device.[0004]2. Related Art[0005]As a conventional insulating switching power supply device, for example, flowing inventions are proposed. WO / 2000 / 013318-A proposes a semiconductor device that includes multiple output switching transistors having different on resistances respectively. While the multiple output switching transistors are on-operation, the transistor is turned on in order of the great to small of the on resistance. On the contrary, during off operation, the transistors are turned off in o...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02M3/158H02M1/44H02M1/00
CPCH02M3/1588H02M1/44H02M2001/0054Y02B70/1466Y02B70/1491H02M1/0054Y02B70/10
Inventor SOHMA, SHOHTAROH
Owner NISSHINBO MICRO DEVICES INC